As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
How cold it is ! We’ve never had ________this winter.
It was at the very beginning ______ Mr Smith made a decision _____we should send for a doctor.
——I’m afraid I can’t finish the magazine within the required time. ——__________.
—Excuse me, Professor Smith, I was wondering if I could leave a quarter earlier today. — _____ .
Green products are becoming more and more popular because they are environmentally _________.